#win10-login {
    background: url('../img/wallpapers/main.jpg') no-repeat fixed;
    width: 100%;
    height: 100%;
    background-size: 100% 100%;
    position: fixed;
    z-index: -1;
    top: 0;
    left: 0;
}

#win10-login-box {
    width: 300px;
    overflow: hidden;
    margin: 0 auto;
}

.win10-login-box-square {
    width: 105px;
    margin: 0 auto;
    border-radius: 50%;
    background-color: darkgray;
    position: relative;
    overflow: hidden;
}

.win10-login-box-square::after {
    content: "";
    display: block;
    padding-bottom: 100%;
}

.win10-login-box-square .content {
    position: absolute;
    width: 100%;
    height: 100%;
}

input {
    width: 90%;
    display: block;
    border: 0;
    margin: 0 auto;
    line-height: 36px;
    font-size: 20px;
    padding: 0 1em;
    border-radius: 5px;
    margin-bottom: 11px;
}

.login-username, .login-password {
    width: 91%;
    font-size: 13px;
    color: #999;
}

.login-password {
    width: calc(91% - 54px);
    -webkit-border-radius: 2px 0 0 2px;
    -moz-border-radius: 2px 0 0 2px;
    border-radius: 5px 0 0 5px;
    margin: 0px;
    float: left;
}

.login-submit {
    margin: 0px;
    float: left;
    -webkit-border-radius: 0 5px 5px 0;
    -moz-border-radius: 0 5px 5px 0;
    border-radius: 0 5px 5px 0;
    background-color: #009688;
    width: 54px;
    display: inline-block;
    height: 36px;
    line-height: 36px;
    padding: 0 auto;
    color: #fff;
    white-space: nowrap;
    text-align: center;
    font-size: 14px;
    border: none;
    cursor: pointer;
    opacity: .9;
    filter: alpha(opacity=90);

}